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根据化学方程式解化学计算题,若有多个未知数需要求解,可采用代数方程组的解法。由于一个方程只找一种关系,条理分明,所以,学生容易理解、掌握。例1.用铁和锌的混合物1.5克,跟足量稀硫酸反应,放出的氢气在标准状况下有0.56升,求铁、锌各有几克?已知原子量:Fe=56,Zn=65。铁锌各1摩尔分别跟酸作用,都是放出1摩尔氢气,在标准状况下所占体积都是22.4升。设
According to the chemical equation solution chemistry problem, if there are multiple unknowns to be solved, the solution of algebraic equations can be used. Because an equation only find a relationship, structured, so easy to understand and master the students. Example 1. Using 1.5 grams of a mixture of iron and zinc, react enough with dilute sulfuric acid to give 0.56 liters of standard hydrogen, iron and zinc, each with several grams? Known atomic weight: Fe = 56, Zn = 65 . Iron and zinc, respectively, with 1 mol each role of the acid, are released 1 mole of hydrogen, the volume under the standard conditions are 22.4 liters. Assume